It's very rare I do a 'but what if it was the other way round?'. in this case I think it's valid to do so. What if.....it was an outfit for a baby girl that said 'Hello gentlemen - I'm here'.
We've had threads on here before about how the sexualisation of girls' clothes has gone further than most people are comfortable with, and I don't think it suddenly becomes just 'twee and tacky' when the message is on clothing for a boy.
Horrendous might be a bit strong, but I equally don't think it's something to just shrug your shoulders about.